There’s a moment in “Klara and the Sun,” Kazuo Ishiguro’s first novel since winning the Nobel Prize in Literature in 2017, in which the protagonist, Klara, and another character, The Father, are discussing whether artificial intelligence may ever fully replicate what it means to be human. The Father is skeptical, and likens the human heart to a house with many rooms: “‘But then suppose you stepped into one of those rooms’ he said, ‘and discovered another room within it. And inside that room, another room still. Rooms within rooms within rooms.’” Klara — herself an AF (artificial friend) — disagrees, and thinks there must be a limit, a point where every aspect of a person can be understood.